James thomson



(No Model.) V

J. & G. THOMSON. IRON PIPE PATTERN.

No; 571,413. Patented Nov. 17, 1896.

NITED STATES ATENT Prion.

JAMES THOMSON, OF HAMILTON, AND GEORGE THOMSON, OF DUNDAS,

CANADA.

PATTERN.

SPECIFICATION forming part of Letters Patent No. 571,413, dated November17, 1896. Application filed December 23, 1895. fierial No. 573,046. (Nomodel.)

To aZZ whom it puny concern:

Be it known that we, JAMES THOMSON, pipefounder, residing at the city ofHamilton, and GEORGE THOMSON, machinist, residing at the town of Dundas,in the county of Wentworth," in the Province of Ontario, Canada, bothbeing British subjects, have invented certain new and usefulImprovements in Iron-Pipe Patterns, being a device or apparatus to beattached to the ends of iron-pipe patterns for the purpose of insuringan absolutely true and eoncentricbead on iron pipes; and we do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itappertains to use the same.

l-Ieretofore the pattern for the portion of an iron pipe which is calledthe bead has been separate and detached from the pattern for the body ofthe pipe, and in order to obtain a mold for a pipe with its bead thepipe-pattern has been placed on top of the pattern for the bead andfastened there while the molding sand was rammed around the pattern. Thepattern for the body of the pipe was then withdrawn from the mold andthe mold lifted off the bead-pattern (which was on the ramming-stool)and transferred to the pouringseat. If the pipepa-ttern,which iscylindrical in shape, had a projecting end corresponding to the bead onthe pipe, it would be impossible to withdraw the pattern from the moldwithout destroying the mold, as the diameter of the bead is greater thanthe diameter of the pipe immediately next to it. As a consequence ofthis method of molding pipes it frequently happens that the bead is notexactly coneentrio with the pipe, and the pipe has to be re jected onthat account.

The object of ourinvention is to make the pattern for the bead anintegral part of the pattern for the pipe and to secure a bead that mustnecessarily be exactly concentric with the pipe. We attain that obj eetby the 1nechanism illustrated in the accompanying drawings, in whichFigures I and II are longitudinal sections of a pipe-pattern with theapparatus in question attached to the foot or lower end thereof. Fig. Iat the right represents the pipe-pattern in position on the pouring-seatwith the sand rammed about it, and at the left represents the pattern inthe act of being withdrawn The essential feature of the inventioneonsists of one or more metal slicks or slickers c e, hinged to agearing d, which gearing revolves around an axis formed by the rod 6,running through the center of the pattern, the revolution of the gearingbeing produced by a rod and erankf and g, ending in a pinion 72 \Vhenthe pattern rests on the pouring-seat, the slicks from the upwardpressure of the pouring-seat take the position indicated at the right ofFig. I, and the outer ends of the slicks, which project beyond the lineof the pattern, correspond in outline to the outline of the beadto beformed on the end of the pipe. WVhen the pattern is in this position,the sand I F is rammed in the ordinary way. The gearing, to which theslicks are attached is then made to revolve by turning thecrankeontrolling the rod f, and thus the mold or matrix for the bead isformed in the sand. hen the pattern is withdrawn from the mold in the ordinary way and as it is raised from the pouring-seat, the outer ends ofthe slicks fall downward and inward by their own Weight, as shown at theleft of Fig. I, and thus make no interference with the mold for thepipe.

In Fig. I the rod 6, running longitudinally through the center of thepattern,-is an ordinary rod of a pipe-pattern fastened to the head ofthe pattern by a block y and nut z, and said rod, nut, and block are nopart of our invention,but are common to all pipe-patterns in ordinaryuse.

Fig. II shows the pinion at the end of the rodf, controlling themovement of the gearing d, to the under side of which the slicks arehinged.

In Fig. II the slicks are supposed to be in the position indicated atthe left of Fig. I.

Fig. III is a similar view to Fig. II, except that the pattern issupposed to be resting on the pouring-seat, and the :slicks c c are inposition to form the mold for the head, as represented at the right ofFig. I.

Fig. IV is a View of the under side of the gearing (Z, showing the formof the slicks adopted by usand the'method inwhichthey i when the patternis resting on its end, project are hinged to the gearing.

It is manifest that it is immaterial how many slicks there may be, andthat one slick would do the Work as well as two or more. If only oneslick is used, the header will have to make one complete revolution toform the mold. If there were-severalslicks, a partial revolution of theheader would be sufficient.

What we claim as ourinvention, and desire to secure by Letters Patent,is

A mechanical device to be attached to the foot-"or lower endof iron-pipepatternsto form a mold or 'matrix for the bead consisting of one,=two ormore slicks or slickers c 0, each so connected by a hinge to the underside of a plate or gearing d d, revolving. around the axis of apipe-pattern, that when the pattern is suspended perpendicularly, theslicks of their own weight fall to such a position, that their outermostpointis within the lines of the external surface of the pattern, butwhich beyond the line of the pattern, and can be made to revolve in thatposition by means of a crank g, rod f, and pinion h acting on the plateor gearing to which the slicks are hinged, such slicks being so shapedat their projecting ends, astoeXcavate-in the sand a mold or matrixflora pipe-beading; all substantially as above set forth.

JAS. THOMSON. 7 GEORGE THOMSON. Witnesses THos'H. ORERAR, JOHN I.STUART.

